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Phase Equilibria and Crystal Chemistry of the Binary and Ternary Barium Polytitanates and Crystallography of the Barium Zinc Polytitanates

✍ Scribed by R.S. Roth; C.J. Rawn; C.G. Lindsay; W. Wong-Ng

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
665 KB
Volume
104
Category
Article
ISSN
0022-4596

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✦ Synopsis

The ternary system (\mathrm{BaO}-\mathrm{ZnO}-\mathrm{TiO}{2}) is of great interest for use in the production of microwave dielectric ceramics, as the temperature coefficient of the dielectric constant for a ternary phase in the system has the opposite sign from that of the major component in such devices, (\mathrm{BaTi}{4} \mathrm{O}{9}). The ternary system has been found to contain four ternary phases, ideally (\mathrm{BaZn}{2} \mathrm{Ti}{4} \mathrm{O}{11}, \mathrm{Ba}{4} \mathrm{ZnTi}{11} \mathrm{O}{27}, \mathrm{Ba}{2} \mathrm{ZnTi}{5} \mathrm{O}{13}), and (\mathrm{Ba}{x} \mathrm{Zn}{x} \mathrm{Ti}{8-x} \mathrm{O}{16})-hollandite. Compatibility triangles for the ternary system have been established and the crystal chemistry and crystal structure of each of the phases was investigated. The phase equilibria data and crystal structures are compared with those encountered in the binary system and other ternary and more complex systems involving barium polytitanates.

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